diff --git a/PVE/API2/Storage/Status.pm b/PVE/API2/Storage/Status.pm
index 7069244..11ad60f 100644
--- a/PVE/API2/Storage/Status.pm
+++ b/PVE/API2/Storage/Status.pm
@@ -413,11 +413,7 @@ __PACKAGE__->register_method ({
 	my $size = -s $tmpfilename;
 	die "temporary file '$tmpfilename' does not exist\n" if !defined($size);
 
-	my $filename = $param->{filename};
-
-	chomp $filename;
-	$filename =~ s/^.*[\/\\]//;
-	$filename =~ s/[^-a-zA-Z0-9_.]/_/g;
+	my $filename = PVE::Storage::normalize_content_filename($param->{filename});
 
 	my $path;
 
diff --git a/PVE/Storage.pm b/PVE/Storage.pm
index 719fe5b..b8e6311 100755
--- a/PVE/Storage.pm
+++ b/PVE/Storage.pm
@@ -1945,4 +1945,16 @@ sub assert_sid_unused {
     return undef;
 }
 
+# removes leading/trailing spaces and (back)slashes completely
+# substitutes every non-ASCII-alphanumerical char with '_', except '_.-'
+sub normalize_content_filename {
+    my ($filename) = @_;
+
+    chomp $filename;
+    $filename =~ s/^.*[\/\\]//;
+    $filename =~ s/[^a-zA-Z0-9_.-]/_/g;
+
+    return $filename;
+}
+
 1;